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I don't know how it would be in London, but as an American I wouldn't use Achilles because it seems so specific to the one Greek hero. I'd probably go with Achilleos, that's the family name and it's closer to Achilles (as opposed to Aquiles which looks like it has to do with eagles instead of being a form of Achilles).
Maybe his name is Achilleos and Aquiles is a name his dad calls him informally? (I know I've met people who have legal names in one language but one or noth of their parents call them by a version of their name in a different language as a nickname/preferred name)